Voynex Email Guard is a JavaScript script designed to protect email addresses on a Web site from email harvesting software while making this protection transparent (invisible) for the Web site visitor. Users can still click, copy, and paste email addresses without knowing that the email address on the Web site is encrypted. Voynex Email Guard transforms email addresses on a Web page into a format that is unreadable for email harvester robots, but makes these addresses readable again for Web site visitors.

RetinaPost is a PHP class/WP plugin that makes CAPTCHA's clean and engaging using feeds or custom text. It is easy and intuitive for your Web site visitors. You can choose to use your feed or custom text to inform or guide the user to read more articles or to perform other actions. Use RetinaPost to stop spam and bots on forms, on comment posts, new account registrations, polls and surveys, and more.

Q-Mail Max Rcpt Patch allows you to set a limit on how many recipients are specified for any one email message. RFC 2821 section 4.5.3.1 says that an MTA must allow at least 100 recipients for each message, but may elect not to allow any more than that. Choosing to enforce this limit can help mitigate damage from one of the favorite tricks of the spammer.

RainCaptcha is a CAPTCHA class that does not require any image processing extensions (GD, ImageMagick, etc). CAPTCHA was developed to be readable by humans and resistant to OCR software. It generates black-and-white images with 5 distorted letters on them and noise. Its checking algorithm is case-insensitive.

Collax Groupware Suite is a complete collaboration, e-mail, and messaging server with Outlook MAPI support. It offers enterprise email server functions, anti-spam and anti-virus filters, GUI management, a file server for SMB, NFS, FTP, and Apple shares, backup/restore server, IM server, and fax and SMS server. The groupware offers AJAX Web mail, calendar, team calendar, contacts, and tasks, and supports ActiveSync for mobile devices. It is free for private or commercial use of up to five users.

ExtraWatch is a real-time counter and live stats module for Joomla!, Wordpress, Drupal, Magento, and Prestashop. It allows you to view information about your visitors and bots in real-time from the administration back-end. It details IP addresses, countries of origin, geographical location, which pages they are viewing, and browser and operating system. It creates daily and all-time stats from these data plus unique, pageload, and total hits statistics. Furthermore, you can block harmful IP addresses, see blocked attempts, evaluate trend charts, and create goals based on many parameters. In the front-end, it displays top countries, and user and visit information for certain periods of time.

The Securepoint Unified Threat Management (UTM) security solutions provide all important security applications (firewall, VPN gateway, virus scanner, spam filter, Web filter, IDS, etc.) within a corresponding server environment, to ensure smooth updates of all systems and to make the everyday usage of these systems successful and secure for companies. They are available as UTM hardware appliances, as virtual appliances, and as a pure software solution which can be installed on standard computer systems and may be adjusted according to individual requirements. Securepoint is Windows 7-ready and supports IKEv1 and IKEv2.

MailCleaner is an anti-spam/anti-virus SMTP
gateway with user and admin
Web interfaces, a quarantine system, and support
for multiple domains,
templates, and languages. It's based on Debian and
uses Bayes, RBLs,
Spamassassin, MailScanner, and ClamAV.

SpamCheck is an email scanning and quarantine system for Linux systems. Making use of a number of open source technologies, including SpamAssassin, Exim, and MySQL, it provides an easy-to-use, but powerful method to filter email for your domain. Once configured, multiple domains can be added and administered with the Web interface. Email is scanned and scored, non-spam is then passed on to a destination email server, while spam is either blocked or quarantined. Individual users can log in and review their quarantined email, and manage their settings through the Web-based interface.